Manufacture of photographic printing fabric



June 5, 1934. L, GQEDTLER MNUFACTURE OF PHOTOGRAPHIC PRINTING FABRICFiled March 1. 1933 Patented June 5, 1934 PATENTv OFFICE.

MANUFACTURE F PHOTOGRAPIIIC PRINTING FABRIC Louis Goedtler, Brussels,Belgium Application March 1, 1933, Serial No. 659,202

. In Germany March 1, 1932 3 Claims.

This invention relates to improvements in the manufacture ofphotographic printing fabrics, more-particularly to the preparation ofal novel and improved support or backing for light-sensi- 5tive'emulsions.

Many fabrics and other materials in sheet form are already known,possessing the appearance of artificial leather.. Said materials aregenerally prepared by applying upon a foundation such, for

lo example, as a cotton fabric, a coating of nitrocellulose, colouringmaterials, powdered metals or other ingredients.

In the accompanying diagrammatic drawing forming part hereof, Figure 1represents a fragment of a photographic pr.nting fabric made accordingto the present invention and embodying the essential features thereof,the view'being taken as a section on line 1-1 of Figure 2.

Figure 2 is a plan view of a length .of such photographic printingfabric where'n portions of various coatings are removed to reveal thosebeneath.

Figure 3 diagrammatically represents the steps of manufacture followedin practising the invention to produce the present fabric.

The same reference indicia refer to the same parts or featuresthroughout the views.

I have ascertaned that under certain conditions materials of the classdescribed may be used as effective and satisfactory supports orlbackings for light-sensitive emulsions.

Referring now again to the drawing, according to my invention, I preferto use'for this purpose a material whereof the foundation consists ofafabric 1, grained or shagreened as at 5, and having thereupon arespectively grained or shagreened superficial. coating 2 of a celluloseester and of powdered metal.

By this means, I obtaina support or backing for light-sensitiveemulsions, furnishing a particularly effective background for the imageimprinted thereupon and adapted greatly to enhance the depth and reliefeffect of the same.

Until now, it has generally been necessary to prepare a support orbacking of the class devscribed before coating the same with alight-sensitive emulsion, for the reason that the cellulose esterwherewith the support is coated fails to bind uniformly with theemulsion and the latter may flake or peel away from said cellulose-esterafter having become dry.

I have found however that a light-sensitive emulsion may be appliedsafely and uniformly upon the coating 2 of cellulose ester and powdered..3 metal and be caused to adhere securely thereto by adopting themethod commonly used in the manufacture of photographic lms and applyingto said coating of cellulose ester and powdered metal a thin layer 3 ofdissolved or llquefled gelatine in the form, for example, of a coldsolution of gelatine in glacial acetic acid and acetone, said layer ofdissolved or liquefied gelatine then constituting a substratum for thelightsensitive emulsion, after having become dry. When this gelatinesubstratum 3 is dry, the light sensitive emulsion 4 may be applied anddried. By this means, the light-sensitive emulsion may be caused toadhere firmly and uniformly to the cellulose-coated surfacelof thematerial used as a foundation therefor. In order further to enhancethebeauty of the finished photograph I may select superficial grainingsor shagreens of varying degrees of coarseness according to theparticular effect which I wish to secure, and produce said superficialmarkings by any suitable means, e. g. by pressing the foundation fabric,or by calendering, same through suitably impressed rollers or the like.i

The grained or shagreened form of the foundation fabric is made evidentin an exaggerated manner at 6 in Figure 1, where it is also obvious thatall the coatings, including the light sensitive emulsion, quite closelyfollow the form of the granulated or grained surface of the foundationfabric.

The process of manufacturing a support for light-sensitive emulsionsaccording to my invention hasv considerable practical advantages overthose proposed hitherto in that it eliminates the need for anypreliminary preparation or treatment of the surface of the backing, andrenders superfluous the use of any lacquers or varnshes.

Furthermore, it provides a suitably metallized surfaceto which thelight-sensitive emulsion adheres uniformly, without tending to peel orflake from the same after drying.

I claim:

1. In combination in a photographic print'ng fabric, a foundation havinga granulated leatherlike surface, a coat of powdered metal in admixturewith a cellulose ester upon said granulated surface,.a film of gelatineupon said coat of powdered metal and cellulose ester, and alight-sensitive emulsion cover ng said coat and film.

2. In combination in a photographic printing fabric, a foundation offabric having the appearance of leather, the surface of said fabricbeing shagreened, a compoundedcoatlng of a cellulose ester and ofpowdered metal upon said shagreened surface, a layer of gelatin uponsaid coating of said granulated surface, a film of gelatine dissolved inglacial acetic acid and acetone upon said coating, and a layer of lightsensitive emulsion evenly applied upon said film, the exposed surface ofsaid layer of emulsion following the granulations on said foundation.

' LOUIS GOEDTLER.

